Device for tensioning printing plates particularly steel engraved plates on printing presses



United StateS Patoof DEvICE EoR TNSIoN-IG PRTnG LATES PABTICULARLY STEELENGRAvD LATS oN PRINTG PRESSEs vv SuherHch, l)afnlsfadbEhersadt, (;ermanass no to Maschinenfah!ik Goehel G.n1.bJ1., Dafmstadf, German E11ed1`Iov. 10, 1959, Sof. No. 852,130 claimS riorit a caoon German Nov. 13,1958 8 (ai111S. CL 101-415.1

TiS invention felates to devices fo1 fnonnting printing plates intenSioned condition on oyli11deTS of fotaTy print ing f1ac11i11eS- Inofdef to secoTe Stee1 plates on cylinde1S it iS necesSaTy to secnfe oneend of the plate i11 a Tigid secnfing nleans and the otheT end of the1)late is secufed by a tensioning n1eanS in a gfoove i11 the cyliI1 de1,The foTceS 11ecessaTy to secure s11ch steel p1ates on itS oyli11de1 afevery high. In oTder to tenSion the p1ate and hold it i11 place, theTe iSa n1inifnun1 of space avai1 able to SecuTe the plate since so much ofthe Sufface of the plate iS taken up by the SUbiect fnatter fo bepTinted. It is thefefoIe an object of the invention to pfovide a do vicefor a pfinting cyHndef in Which the tension )TodI1c i11g secofing n1eansiS as sn1a11 as poSSible and pfovideS tho high tenSion necesSaTy tosecUTe the Stee1 plate in place. T11e gToove i11 the cylindef ITlust bequite naTTow not only in itS pefiphefy bot alSo in its interna1diTleI1Sio11s.

Another obiect of the invention TeSides in the pfovision of a device inwhich one end of tho plate is Secufed afonnd a blunt edge in the Sidevva11 of a tTansvefSe g1oove in the cy1indef and acting as a levef invvhich one arn1 is act11ated by a Shaft affanged aTanol to the fotayaxis of the cy1inder and the othe1 aftI1 tenSionS the plate. T11efenSioning Inen1befS afe thefefofe n1ade of S Ting natefia1. A- fUTtherobiect of the invention is to pTovide a shaft in the cylinder having agToove theToin into Which the tenSioning 1= e vvith the plate end1)ToiectS and engages one edge of the gfoove. The othe1- tenSioned ho1ding nleanS iS i11 the forn1 of a block vvhich has eccentTic n1eans atboth endS of the cylindef to hold the plato i1 place.

The invention is i11UStTated on the accoopanying dTavving in Which=Figufe 1 iS a cfoSS Section of a paft of the )rinting cy1in der at thepaTt Whefe the late is Secufed, and

Figufe 2 is a Side vieW partly in section of the side of the cy1indefwhefe the plate is Secl1fed iI1 place.

The cyEndef 1 is SnfTonnded by lthe plate 2 Which haS thereon theportions to be pfinted and is 111der tension aTound the cylioder.Adiacent one edge of the plate z thefe iS pfovided a shaTp bent edge 3,and a fnfthef Sharp bent edgo iS pfovided iomediate1y i11 ffoot of edge3. ThuS the edge of the plate iS Secufed in the lock space 4 of the1edge of block 5 and is acfuany secured by this ledge 5 When the lattefis in the position of Fig. 1. T he 1edge of 1ock membef of Wedge 5 isprovided at both endS With aTnS 6 of vvhich one is shovvn in Fig. Z,These afo1S 6 afe affanged pafane1 to the tWo side Wans of the cylindef1 a11d they afe provided vvith an eccentric 7 Which latteT by Totation,Wn1fofce the 1edge 5 against a Wan 8 of a space 9 in the cylinde1 1,This Wan is povided with a stop SuTface 10 Which cooperates With asin1ilaf stop suTface on the block 5 and Which abutS against thiS Stop.The fofceS cfeated by the tenSion in the plate Win be taken up by thestop 10.

The othe1 end of the plato Z is oaTried afound tho fenSio11 stop 11. Fofthis 1)ufpose the plato 2 assun1es z,963,969 Pofenfed peo. 13, 1960 aSharp bend 12 and neaf its end edge it is bent into a half oifclefofolation. In the wa11 opposite the Wan 8 of tho Space of open chan1bef9 thefe iS an obtllse anglo edge 13. The tension stop 11 abutS againStthe edge 13 So that the Inembef 11 Win act aS a lever and When a fofceis applied on itS 1ovveI' aTn1, a considefably highe1 fofce is appliedon the uppef afIn.

.The load on the loWef aTm of the 1evef 11 is achieved by the fotationof the shaft 14 vvhich iS applied and oxtends on the entife 1ength ofthe cylinde1 1 and vvhich at one of both endS iS pTovided th aquadrangular meInber 15. lever 16 is n1onnted on this qnadTangu lafe1ement adiacent the end side of the cyHndef and paTane1 thereto andWhich Wi11 impaft a high fotary mo II1ent on the shaft. The shaft 14 isoTovided With a groove 17 into which the lovver odge of the tension1evef 11 pToiectSl By shaft 14 theTe is pTovided a Sharp edge 18 byWhich upon Totation of the shaft to the 1eft, Fig. 1, the plate 2 beingagainSt the levef 11, the plate Win be fensioned. It ITlay be necessaTyto pfovide a sn1all groove i11 the lovver sufface of the 1evef 11oppoSite the edge 18. The plate 2 W1 be Slightly pfeSSed in at the point18 and thus the 1)late Z vvi11 be held n1ofe securely against the leveI11- 1t is peffectly clear that in view of the conlparatively long levofarm 16, it is poSSible to impaft a high force on the lovve1 aTn1 of theleve1 11. By T1eanS of the tTanSnisSion of the lever 11, the fo1ceS afeincfeased so that a, veTy high fofce can be attained at the nppef edgeof the levef 11 iI1 ofdeT to place the plate 2 nndef fension. TheTequisite tenSion foTce is attained when the lever aTn1 16 iS in theposition shown in Fig, 2, and this fo1ce n1ay be Inaintained by fleansof a Scfow bolt 19 Which latter is Secufed by a nut thefeoo vvhich vvhenTo1eaSed, the bolt 19 may SWing afound the axiS 16 to fTee the leve1afo1 16 to TeleaSe the tension in the 1ate. The shaft 14 need not onlyServe to tension the lever 11 but alSo to Sin1111taneol1sly act as guideof Svving axlo for the block 5 vhen its aT111 6 iS pTovided vith eyeSWhich suTfonnd the shaft 14.

When it iS deSifed to change plates it is vefy eaSy to Temove thetenSion elenlents. It iS only necesSafy to rotate the shaft 14clockWiSe, Fig. 1, by n1eans of the levef 16 until the edge 18 Win freethe tenSion leve1' 11. The end of the plate can then be pnHed out of thespace 9 vithoI1t hindfance. When a new plate iS inSerted the oartS afeopefated in TeveTSe ofde1 f() Secufe the plate on the cy1indef undertension. A1so the block 5 Inay be eaSily loosened by opefating fheeccentTic membeT 7 So that it Inay be TeIIloved ffon1 itS gTip on oneend of the plate, Which Inay then be Temoved.

I claiII1 aS 111y inveI1fion= 1. A device fof tenSioning and secnTing11exib1e print ing p1ateS, pafticulaTly engraved stee1 plates, on cy1indefs of printing preSSeS conlpTising a gToove i11 Said oylinder, SaidgToove having oppoSfto sideS of vvhioh one side has a pToiecting edgewhich acts as a fo1cfuIn and the other side has a sto Surface, a Shaftin the cy1inde1 Iflounted to Totate in the botton1 of the groove andextending thonghout the vvidth of the cylindeT pafalle1 to the TotaryaxiS of the cylinder, a Wedge nTen1bof oo opefating With the stops11Tface to Sec11fe one edge of the 1)1inting plate, a levef abnttingagainSt the fulcrum iI1 the gToove and ovef vvhich the pTinting plate iSSe cUed and bent afound the uppef and lovvel ends of the levef, SaidShaft coopefating with the levef to adiust the latter afound thefulcrun1 and thuS secufe the plate in tenSioned oondition on thecyliI1def.

2. A device fof secufing a 11exible printing plate undet tension on acy1indef of printing Inachines of Which tho cylindof is pTovided With agToove con1pfiSing al shaft the pfoviSion of the gfoove 17 in thofotatably nonnted in tho botton1 of the gfoove and having an edgearfanged longitudinally on the Shaft vvith the latter aTfanged afalle1to the longitudinal axis of the oylinder, one side of said groove havinga p oiecting fulcfnn1 edge, a lever i11 tho groove ab11tting againSt fhefu1cTU1 edge, and a block IneInber on the' othe1 side of the gToove toSecUfe one edge end of tho plate vith the otheI edge end of the plateextending on one Side of the levef and bent aronnd the bottoo1 end ofthe lever, Said edge oo the shaft contactin the late on the- Side of thelevef so that when the Shaft iS Totated the lever vfl1 bear on theflllcruTI1 edge to teI1Sion the plate on the cylinder.

3. A devico accofding to c1ain 2, iI1 Which the levef is compoSed of a Sfing mateiaL 4. A device accofding to daim Z in which the Shaft^ iSpfovided With a groove extending paTallel thefeto aod havng the edge ofthe shaft on one side of the lastn1en tioI1ed groove, Said end of thelever With the plate bent thefeaTound extending i11to the groove io theShaft.

S. A device foI SecnTing a exible 1)riI1ti11g plate llnder tension on acylinder of printing nlachineS of Which the cylinder iS pTovided With agroove, conlpTising a Shaft rotatably Inounted in the bottonl of thegToove and hav ing an edge affanged longitudinally on the shaft With thelatter arfanged paTaHe1 to the longitndinal axis of the cyHndef, oneside of said gToove having a pfoiecting fI11cTuIT1 edge, and the othe1Side 1aving a vva11 poftion vvith a Stop Surface, a levef in the gfooveabI1tting against the fnlcTun1 edge, a block Inen1ber on the othe1 sideof the gToove and having a pfoiecting poftion contacting 4 the vvanportion and tho stop surface fo securo ono edgo ond of the plate vviththe othef edge end of the plate ex tending on one Side of the lever andbent around the bot toII1 end of the lever, Said edge on the shaftcontacting the plate oo the side of the lever So that When the shaft isfotated the leveI WiH beaf on the fulcrum edge to ten sion fhe plate onthe cylinder, aTn1S fo1 the block seoured thefeto and pfovided pafanelto the sido of the cylindof, and a11 eccenffic i11 tho cylinde1cooperating vvith an open ing in the arn1s to tighten the block againstits side of the groove.

6. A device accofding to clain1 in which a levoI is provided oloUnted onthe Shaft, and in Which IIeanS ae pfovided to SecUTo the leveT i11adiuSted poSition.

7. A device accofding to claim S, i1 vvhich a lovef is pTovided 1onntedon the Shaft and having an eXtended end poftion, and iI1. vvhich an oyobolt is provided con nected to the extended end of the 1aStn1entionedleve1 and having a n11t thereo11 and also connected by IneanS of an eyeof the bolt to the cylinder, Said shaft being ad iuSted by fotation ofthe nI1t.

8. A device accofding to c1ainI in Which thefe is a Shafp bent edge oneach end of the plate vv11efe the lattef enteTs the groove in thecylinder.

lefefenoes cifed in the file of this 1)atoof UNITED STATES PATENTSL27S,877 DTange Ang. 13, 1918 Z,0S6,991 TomHn ()ct. 13, 1936 Z 768 .78Pafk et al ()ct. 30, 19So

